Generate universally unique identifiers (UUID v4) instantly - single or bulk, with optional formatting as GUID or without hyphens.
UUID (Universally Unique Identifier) v4 uses 122 bits of cryptographically random data. The probability of a collision among 1 trillion v4 UUIDs is about 1 in a billion.
Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where 4 is the version and y is 8, 9, a or b (variant bits).
A UUID (Universally Unique Identifier), also called a GUID (Globally Unique Identifier), is a 128-bit value used to uniquely identify information in computer systems without requiring a central coordinating authority. Standardised in RFC 4122 in 2005 by the Internet Engineering Task Force, UUIDs are now a cornerstone of distributed computing, database design, and API development. A typical UUID looks like: 550e8400-e29b-41d4-a716-446655440000.
There are five versions of UUIDs. Version 1 is time-based, using the current timestamp and MAC address to ensure uniqueness. Version 3 and Version 5 are name-based, using MD5 and SHA-1 hashing respectively. Version 4 is randomly generated and is the most widely used - it relies on cryptographically secure random number generation, making collisions statistically near-impossible (probability of a collision requires generating 1 billion UUIDs per second for approximately 86 years). This tool generates Version 4 UUIDs using the browser's built-in crypto.randomUUID() API, ensuring cryptographic quality without server involvement.
Indian software teams building microservices, e-commerce platforms, HRMS systems, and government digital infrastructure projects use UUIDs daily for primary keys, session tokens, file names, and API request IDs. Aadhaar-based systems, UPI transaction IDs, and DigiLocker document references all use unique identifier schemes related to UUID principles. The ability to generate bulk UUIDs is useful for seeding test databases, populating CSV imports, or creating unique identifiers for batch processing in data engineering pipelines.